I promise you the font will be too small to read in either portrait or horizontal way. (The pictures are misleading, coz things look bigger than they really are. Just thing how big the device is). The only feasible way would be the reflow mode, as shown in the 2nd pic in your zip. But as you said, the page layout is not pretty in this case. And since there's no bookmark function, it's also troublesome to get back the the part you last read if it's reflowed.
So if you really need to read some double-column files, you'd better mannually edit em to single-column with acrobat pro or something. It's quite easy if the files contain text only. But with diagrams and pictures, it'd be a different story.
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